Portuguese gendarmerie cars with continuous blue lights

Occasionally, I see gendarmerie cars (from the GNR) on Portuguese highways with continuous blue lights on without flashing them or using the siren. As a German, I am not aware of such behavior by police authorities.

What does that mean and (how) does this affect me as a driver in terms of road traffic acts?

driving portugal

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Portuguese gendarmerie cars with continuous blue lights - Police Mobile Passed by Near to Red Car

Portuguese gendarmerie cars with continuous blue lights - An Aerial Photography of an Empty Road with Green Trees and Street Lights

Portuguese gendarmerie cars with continuous blue lights - Vehicles on Road Near Lampposts

Emergency Vehicles Responding Portugal #4

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Images: Renan Bomtempo, Molly Champion, Vladimír Sládek, Tristan Le

Portuguese gendarmerie cars with continuous blue lights

Pictures about "Portuguese gendarmerie cars with continuous blue lights"

Emergency Vehicles Responding Portugal #4

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